高等学校化学学报 ›› 2016, Vol. 37 ›› Issue (3): 546-551.doi: 10.7503/cjcu20150626

• 物理化学 • 上一篇    下一篇

阴离子交换膜修饰的水/1,2-二氯乙烷界面上SO42-离子的转移反应

王欢欢, 胡道盼, 江旭恒, 张烨桦, 陈勇   

  1. 上海应用技术学院化学与环境工程学院, 上海 201418
  • 收稿日期:2015-08-07 修回日期:2015-12-26 出版日期:2016-03-10 发布日期:2015-12-26
  • 通讯作者: 陈勇,男,博士,副教授,主要从事液/液界面电化学以及有机/无机复合介孔膜的制备及应用研究.E-mail:yongchen@sit.edu.cn E-mail:yongchen@sit.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:21005049)和上海市自然科学基金(批准号:14ZR1440900)资助.

Ion-transfer Reaction of SO42- Across the Water/1,2-dichloroethane Interface Modified by an Anion Exchange Membrane

WANG Huanhuan, HU Daopan, JIANG Xuheng, ZHANG Yehua, CHEN Yong   

  1. School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China
  • Received:2015-08-07 Revised:2015-12-26 Online:2016-03-10 Published:2015-12-26
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.21005049) and the National Natural Science Foundation of Shanghai, China(No.14ZR1440900).

摘要:

将一种均相季铵型阴离子交换膜用于修饰水/1,2-二氯乙烷(W/DCE)界面,并利用循环伏安法、差分脉冲伏安法和计时电量法考察了该界面上强亲水性阴离子SO42-的转移反应过程.研究结果表明,该阴离子交换膜所修饰的W/DCE界面比修饰前具有更宽的电化学窗口,而且在界面上可获得完整的SO42-转移的循环伏安曲线和差分脉冲伏安曲线.其中,循环伏安曲线的峰电流与扫速平方根呈线性关系,SO42-在膜内水相中的扩散系数为7.6×10-8 cm2/s;差分脉冲伏安曲线的峰电流与SO42-的浓度在5~25 mmol/L范围内呈线性关系.另外,利用计时电量法测得SO42-在该界面上转移反应的标准速率常数为1.49×10-3 cm/s.

关键词: 阴离子交换膜, 液/液界面, 离子转移, 硫酸根

Abstract:

In this work, the anion-transfer reaction of highly hydrophilic sulfate across the water/1,2-dichloroethane(W/DCE) interface modified by a homogeneous anion exchange membrane(AEM) was investigated by employing cyclic voltammetry(CV), differential pulse voltammetry(DPV) and chronocoulometry. It was found that the electrochemical window could be extended by the modification of W/DCE interface with such an AEM. In addition, the well-defined CV and DPV curves corresponding to the ion-transfer of highly hydrophilic SO42- could be obtained at the modified W/DCE interface. According to the linear relationship between the peak current of CV and the square root of scan rate, as well as the equation of Randles-Sevik, the diffusion coefficient of SO42- in the membrane containing water is calculated to be about 7.6×10-8 cm2/s. In addition, the peak current of DPV increases linearly with the concentration of SO42-within the range of 5-25 mmol/L. Moreover, the standard reaction rate constant of the ion-transfer of SO42- at such an AEM-modified W/DCE interface was estimated to be about 1.49×10-3 cm/s via chronocoulometry.

Key words: Anion exchange membrane, Liquid/liquid interface, Ion transfer, Sulfate

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